I upgraded the cooling fan on the laser itself, and also wired it to run all the time,
this alone us almost enough to prevent any scorching or darkening from the smoke.
I also added a second fan on the side that blows down, and has an on/off switch. (will get a pic later)
This seems to work really well, though I have not done any testing with cutting,
as I stated in another thread, my laser will no longer cut for some odd reason, but seems to engrave fine.